CVE-2020-28493: Regular Expression Denial of Service (ReDoS) in Jinja2
(updated )
This affects the package jinja2 from 0.0.0 and before 2.11.3. The ReDOS vulnerability of the regex is mainly due to the sub-pattern [a-zA-Z0-9.-]+.[a-zA-Z0-9.-]+ This issue can be mitigated by Markdown to format user content instead of the urlize filter, or by implementing request timeouts and limiting process memory.
References
- github.com/advisories/GHSA-g3rq-g295-4j3m
- github.com/pallets/jinja
- github.com/pallets/jinja/blob/ab81fd9c277900c85da0c322a2ff9d68a235b2e6/src/jinja2/utils.py%23L20
- github.com/pallets/jinja/commit/15ef8f09b659f9100610583938005a7a10472d4d
- github.com/pallets/jinja/pull/1343
- github.com/pypa/advisory-database/tree/main/vulns/jinja2/PYSEC-2021-66.yaml
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PVAKCOO7VBVUBM3Q6CBBTPBFNP5NDXF4
- nvd.nist.gov/vuln/detail/CVE-2020-28493
- security.gentoo.org/glsa/202107-19
- snyk.io/vuln/SNYK-PYTHON-JINJA2-1012994
Code Behaviors & Features
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